Gary Cote wrote: >I'm not aware of much in the way of guidelines that will help you out here. > >rfc3261 says the UAS may send as many provisional responses as it likes, >that proxies must immediately forward all non-100 provisional responses >(unless they've already forwarded a final response), and that, if the session >takes a while to set up, the UAS should send a non-100 provisional response >at least every minute. > >
Thanks. Thats the answer I was looking for. I see that in RFC 3261 section 13.3.1.1 it says: To prevent cancellation, the UAS MUST send a non-100 provisional response at every minute, to handle the possibility of lost provisional responses. I think it implies you should send Ringing every minute (not exponential backoff). >If you're sending multiple ringing responses for purposes of redundant >signaling, >then you might consider some exponential backoff algorithm using T1 (or some >multiple of T1) as a starting interval. But, then, you might want to >consider using >100rel instead. > >Just some ideas ... take 'em or leave 'em. Good luck, regardless. > > > -- M. Ranganathan Advanced Networking Technologies Division, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. Advanced Networking Technologies For the People! _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
